<?php
/*=======================================================================
 // File:        JPGRAPH_DATE.PHP
 // Description: Classes to handle Date scaling
 // Created:     2005-05-02
 // Ver:         $Id: jpgraph_date.php 1106 2009-02-22 20:16:35Z ljp $
 //
 // Copyright (c) Asial Corporation. All rights reserved.
 //========================================================================
 */

define('HOURADJ_1',0+30);
define('HOURADJ_2',1+30);
define('HOURADJ_3',2+30);
define('HOURADJ_4',3+30);
define('HOURADJ_6',4+30);
define('HOURADJ_12',5+30);

define('MINADJ_1',0+20);
define('MINADJ_5',1+20);
define('MINADJ_10',2+20);
define('MINADJ_15',3+20);
define('MINADJ_30',4+20);

define('SECADJ_1',0);
define('SECADJ_5',1);
define('SECADJ_10',2);
define('SECADJ_15',3);
define('SECADJ_30',4);


define('YEARADJ_1',0+30);
define('YEARADJ_2',1+30);
define('YEARADJ_5',2+30);

define('MONTHADJ_1',0+20);
define('MONTHADJ_6',1+20);

define('DAYADJ_1',0);
define('DAYADJ_WEEK',1);
define('DAYADJ_7',1);

define('SECPERYEAR',31536000);
define('SECPERDAY',86400);
define('SECPERHOUR',3600);
define('SECPERMIN',60);


class DateScale extends LinearScale {
	private $date_format = '';
	private $iStartAlign = false, $iEndAlign = false;
	private $iStartTimeAlign = false, $iEndTimeAlign = false;

	//---------------
	// CONSTRUCTOR
	function __construct($aMin=0,$aMax=0,$aType='x') {
		assert($aType=="x");
		assert($aMin<=$aMax);

		$this->type=$aType;
		$this->scale=array($aMin,$aMax);
		$this->world_size=$aMax-$aMin;
		$this->ticks = new LinearTicks();
		$this->intscale=true;
	}


	//------------------------------------------------------------------------------------------
	// Utility Function AdjDate()
	// Description: Will round a given time stamp to an even year, month or day
	// argument.
	//------------------------------------------------------------------------------------------

	function AdjDate($aTime,$aRound=0,$aYearType=false,$aMonthType=false,$aDayType=false) {
		$y = (int)date('Y',$aTime); $m = (int)date('m',$aTime); $d = (int)date('d',$aTime);
		$h=0;$i=0;$s=0;
		if( $aYearType !== false ) {
			$yearAdj = array(0=>1, 1=>2, 2=>5);
			if( $aRound == 0 ) {
				$y = floor($y/$yearAdj[$aYearType])*$yearAdj[$aYearType];
			}
			else {
				++$y;
				$y = ceil($y/$yearAdj[$aYearType])*$yearAdj[$aYearType];
			}
			$m=1;$d=1;
		}
		elseif( $aMonthType !== false ) {
			$monthAdj = array(0=>1, 1=>6);
			if( $aRound == 0 ) {
				$m = floor($m/$monthAdj[$aMonthType])*$monthAdj[$aMonthType];
				$d=1;
			}
			else {
				++$m;
				$m = ceil($m/$monthAdj[$aMonthType])*$monthAdj[$aMonthType];
				$d=1;
			}
		}
		elseif( $aDayType !== false ) {
			if( $aDayType == 0 ) {
				if( $aRound == 1 ) {
					//++$d;
					$h=23;$i=59;$s=59;
				}
			}
			else {
				// Adjust to an even week boundary.
				$w = (int)date('w',$aTime); // Day of week 0=Sun, 6=Sat
				if( true ) { // Adjust to start on Mon
					if( $w==0 ) $w=6;
					else --$w;
				}
				if( $aRound == 0 ) {
					$d -= $w;
				}
				else {
					$d += (7-$w);
					$h=23;$i=59;$s=59;
				}
			}
		}
		return mktime($h,$i,$s,$m,$d,$y);

	}

	//------------------------------------------------------------------------------------------
	// Wrapper for AdjDate that will round a timestamp to an even date rounding
	// it downwards.
	//------------------------------------------------------------------------------------------
	function AdjStartDate($aTime,$aYearType=false,$aMonthType=false,$aDayType=false) {
		return $this->AdjDate($aTime,0,$aYearType,$aMonthType,$aDayType);
	}

	//------------------------------------------------------------------------------------------
	// Wrapper for AdjDate that will round a timestamp to an even date rounding
	// it upwards
	//------------------------------------------------------------------------------------------
	function AdjEndDate($aTime,$aYearType=false,$aMonthType=false,$aDayType=false) {
		return $this->AdjDate($aTime,1,$aYearType,$aMonthType,$aDayType);
	}

	//------------------------------------------------------------------------------------------
	// Utility Function AdjTime()
	// Description: Will round a given time stamp to an even time according to
	// argument.
	//------------------------------------------------------------------------------------------

	function AdjTime($aTime,$aRound=0,$aHourType=false,$aMinType=false,$aSecType=false) {
		$y = (int)date('Y',$aTime); $m = (int)date('m',$aTime); $d = (int)date('d',$aTime);
		$h = (int)date('H',$aTime); $i = (int)date('i',$aTime); $s = (int)date('s',$aTime);
		if( $aHourType !== false ) {
			$aHourType %= 6;
			$hourAdj = array(0=>1, 1=>2, 2=>3, 3=>4, 4=>6, 5=>12);
			if( $aRound == 0 )
			$h = floor($h/$hourAdj[$aHourType])*$hourAdj[$aHourType];
			else {
				if( ($h % $hourAdj[$aHourType]==0) && ($i > 0 || $s > 0) ) {
					$h++;
				}
				$h = ceil($h/$hourAdj[$aHourType])*$hourAdj[$aHourType];
				if( $h >= 24 ) {
					$aTime += 86400;
					$y = (int)date('Y',$aTime); $m = (int)date('m',$aTime); $d = (int)date('d',$aTime);
					$h -= 24;
				}
			}
			$i=0;$s=0;
		}
		elseif( $aMinType !== false ) {
			$aMinType %= 5;
			$minAdj = array(0=>1, 1=>5, 2=>10, 3=>15, 4=>30);
			if( $aRound == 0 ) {
				$i = floor($i/$minAdj[$aMinType])*$minAdj[$aMinType];
			}
			else {
				if( ($i % $minAdj[$aMinType]==0) && $s > 0 ) {
					$i++;
				}
				$i = ceil($i/$minAdj[$aMinType])*$minAdj[$aMinType];
				if( $i >= 60) {
					$aTime += 3600;
					$y = (int)date('Y',$aTime); $m = (int)date('m',$aTime); $d = (int)date('d',$aTime);
					$h = (int)date('H',$aTime); $i = 0;
				}
			}
			$s=0;
		}
		elseif( $aSecType !== false ) {
			$aSecType %= 5;
			$secAdj = array(0=>1, 1=>5, 2=>10, 3=>15, 4=>30);
			if( $aRound == 0 ) {
				$s = floor($s/$secAdj[$aSecType])*$secAdj[$aSecType];
			}
			else {
				$s = ceil($s/$secAdj[$aSecType]*1.0)*$secAdj[$aSecType];
				if( $s >= 60) {
					$s=0;
					$aTime += 60;
					$y = (int)date('Y',$aTime); $m = (int)date('m',$aTime); $d = (int)date('d',$aTime);
					$h = (int)date('H',$aTime); $i = (int)date('i',$aTime);
				}
			}
		}
		return mktime($h,$i,$s,$m,$d,$y);
	}

	//------------------------------------------------------------------------------------------
	// Wrapper for AdjTime that will round a timestamp to an even time rounding
	// it downwards.
	// Example: AdjStartTime(mktime(18,27,13,2,22,2005),false,2) => 18:20
	//------------------------------------------------------------------------------------------
	function AdjStartTime($aTime,$aHourType=false,$aMinType=false,$aSecType=false) {
		return $this->AdjTime($aTime,0,$aHourType,$aMinType,$aSecType);
	}

	//------------------------------------------------------------------------------------------
	// Wrapper for AdjTime that will round a timestamp to an even time rounding
	// it upwards
	// Example: AdjEndTime(mktime(18,27,13,2,22,2005),false,2) => 18:30
	//------------------------------------------------------------------------------------------
	function AdjEndTime($aTime,$aHourType=false,$aMinType=false,$aSecType=false) {
		return $this->AdjTime($aTime,1,$aHourType,$aMinType,$aSecType);
	}

	//------------------------------------------------------------------------------------------
	// DateAutoScale
	// Autoscale a date axis given start and end time
	// Returns an array ($start,$end,$major,$minor,$format)
	//------------------------------------------------------------------------------------------
	function DoDateAutoScale($aStartTime,$aEndTime,$aDensity=0,$aAdjust=true) {
		// Format of array
		// array ( Decision point,  array( array( Major-scale-step-array ),
		//       array( Minor-scale-step-array ),
		//       array( 0=date-adjust, 1=time-adjust, adjustment-alignment) )
		//
		$scalePoints =
		array(
		/* Intervall larger than 10 years */
		SECPERYEAR*10,array(array(SECPERYEAR*5,SECPERYEAR*2),
		array(SECPERYEAR),
		array(0,YEARADJ_1, 0,YEARADJ_1) ),

		/* Intervall larger than 2 years */
		SECPERYEAR*2,array(array(SECPERYEAR),array(SECPERYEAR),
		array(0,YEARADJ_1) ),

		/* Intervall larger than 90 days (approx 3 month) */
		SECPERDAY*90,array(array(SECPERDAY*30,SECPERDAY*14,SECPERDAY*7,SECPERDAY),
		array(SECPERDAY*5,SECPERDAY*7,SECPERDAY,SECPERDAY),
		array(0,MONTHADJ_1, 0,DAYADJ_WEEK, 0,DAYADJ_1, 0,DAYADJ_1)),

		/* Intervall larger than 30 days (approx 1 month) */
		SECPERDAY*30,array(array(SECPERDAY*14,SECPERDAY*7,SECPERDAY*2, SECPERDAY),
		array(SECPERDAY,SECPERDAY,SECPERDAY,SECPERDAY),
		array(0,DAYADJ_WEEK, 0,DAYADJ_1, 0,DAYADJ_1, 0,DAYADJ_1)),

		/* Intervall larger than 7 days */
		SECPERDAY*7,array(array(SECPERDAY,SECPERHOUR*12,SECPERHOUR*6,SECPERHOUR*2),
		array(SECPERHOUR*6,SECPERHOUR*3,SECPERHOUR,SECPERHOUR),
		array(0,DAYADJ_1, 1,HOURADJ_12, 1,HOURADJ_6, 1,HOURADJ_1)),

		/* Intervall larger than 1 day */
		SECPERDAY,array(array(SECPERDAY,SECPERHOUR*12,SECPERHOUR*6,SECPERHOUR*2,SECPERHOUR),
		array(SECPERHOUR*6,SECPERHOUR*2,SECPERHOUR,SECPERHOUR,SECPERHOUR),
		array(1,HOURADJ_12, 1,HOURADJ_6, 1,HOURADJ_1, 1,HOURADJ_1)),

		/* Intervall larger than 12 hours */
		SECPERHOUR*12,array(array(SECPERHOUR*2,SECPERHOUR,SECPERMIN*30,900,600),
		array(1800,1800,900,300,300),
		array(1,HOURADJ_1, 1,MINADJ_30, 1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5) ),

		/* Intervall larger than 2 hours */
		SECPERHOUR*2,array(array(SECPERHOUR,SECPERMIN*30,900,600,300),
		array(1800,900,300,120,60),
		array(1,HOURADJ_1, 1,MINADJ_30, 1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5) ),

		/* Intervall larger than 1 hours */
		SECPERHOUR,array(array(SECPERMIN*30,900,600,300),array(900,300,120,60),
		array(1,MINADJ_30, 1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5) ),

		/* Intervall larger than 30 min */
		SECPERMIN*30,array(array(SECPERMIN*15,SECPERMIN*10,SECPERMIN*5,SECPERMIN),
		array(300,300,60,10),
		array(1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5, 1,MINADJ_1)),

		/* Intervall larger than 1 min */
		SECPERMIN,array(array(SECPERMIN,15,10,5),
		array(15,5,2,1),
		array(1,MINADJ_1, 1,SECADJ_15, 1,SECADJ_10, 1,SECADJ_5)),

		/* Intervall larger than 10 sec */
		10,array(array(5,2),
		array(1,1),
		array(1,SECADJ_5, 1,SECADJ_1)),

		/* Intervall larger than 1 sec */
		1,array(array(1),
		array(1),
		array(1,SECADJ_1)),
		);

		$ns = count($scalePoints);
		// Establish major and minor scale units for the date scale
		$diff = $aEndTime - $aStartTime;
		if( $diff < 1 ) return false;
		$done=false;
		$i=0;
		while( ! $done ) {
			if( $diff > $scalePoints[2*$i] ) {
				// Get major and minor scale for this intervall
				$scaleSteps = $scalePoints[2*$i+1];
				$major = $scaleSteps[0][min($aDensity,count($scaleSteps[0])-1)];
				// Try to find out which minor step looks best
				$minor = $scaleSteps[1][min($aDensity,count($scaleSteps[1])-1)];
				if( $aAdjust ) {
					// Find out how we should align the start and end timestamps
					$idx = 2*min($aDensity,floor(count($scaleSteps[2])/2)-1);
					if( $scaleSteps[2][$idx] === 0 ) {
						// Use date adjustment
						$adj = $scaleSteps[2][$idx+1];
						if( $adj >= 30 ) {
							$start = $this->AdjStartDate($aStartTime,$adj-30);
							$end   = $this->AdjEndDate($aEndTime,$adj-30);
						}
						elseif( $adj >= 20 ) {
							$start = $this->AdjStartDate($aStartTime,false,$adj-20);
							$end   = $this->AdjEndDate($aEndTime,false,$adj-20);
						}
						else {
							$start = $this->AdjStartDate($aStartTime,false,false,$adj);
							$end   = $this->AdjEndDate($aEndTime,false,false,$adj);
							// We add 1 second for date adjustment to make sure we end on 00:00 the following day
							// This makes the final major tick be srawn when we step day-by-day instead of ending
							// on xx:59:59 which would not draw the final major tick
							$end++;
						}
					}
					else {
						// Use time adjustment
						$adj = $scaleSteps[2][$idx+1];
						if( $adj >= 30 ) {
							$start = $this->AdjStartTime($aStartTime,$adj-30);
							$end   = $this->AdjEndTime($aEndTime,$adj-30);
						}
						elseif( $adj >= 20 ) {
							$start = $this->AdjStartTime($aStartTime,false,$adj-20);
							$end   = $this->AdjEndTime($aEndTime,false,$adj-20);
						}
						else {
							$start = $this->AdjStartTime($aStartTime,false,false,$adj);
							$end   = $this->AdjEndTime($aEndTime,false,false,$adj);
						}
					}
				}
				// If the overall date span is larger than 1 day ten we show date
				$format = '';
				if( ($end-$start) > SECPERDAY ) {
					$format = 'Y-m-d ';
				}
				// If the major step is less than 1 day we need to whow hours + min
				if( $major < SECPERDAY ) {
					$format .= 'H:i';
				}
				// If the major step is less than 1 min we need to show sec
				if( $major < 60 ) {
					$format .= ':s';
				}
				$done=true;
			}
			++$i;
		}
		return array($start,$end,$major,$minor,$format);
	}

	// Overrides the automatic determined date format. Must be a valid date() format string
	function SetDateFormat($aFormat) {
		$this->date_format = $aFormat;
		$this->ticks->SetLabelDateFormat($this->date_format);
	}

	function AdjustForDST($aFlg=true) {
		$this->ticks->AdjustForDST($aFlg);
	}


	function SetDateAlign($aStartAlign,$aEndAlign=false) {
		if( $aEndAlign === false ) {
			$aEndAlign=$aStartAlign;
		}
		$this->iStartAlign = $aStartAlign;
		$this->iEndAlign = $aEndAlign;
	}

	function SetTimeAlign($aStartAlign,$aEndAlign=false) {
		if( $aEndAlign === false ) {
			$aEndAlign=$aStartAlign;
		}
		$this->iStartTimeAlign = $aStartAlign;
		$this->iEndTimeAlign = $aEndAlign;
	}


	function AutoScale($img,$aStartTime,$aEndTime,$aNumSteps,$_adummy=false) {
		// We need to have one dummy argument to make the signature of AutoScale()
		// identical to LinearScale::AutoScale
		if( $aStartTime == $aEndTime ) {
			// Special case when we only have one data point.
			// Create a small artifical intervall to do the autoscaling
			$aStartTime -= 10;
			$aEndTime += 10;
		}
		$done=false;
		$i=0;
		while( ! $done && $i < 5) {
			list($adjstart,$adjend,$maj,$min,$format) = $this->DoDateAutoScale($aStartTime,$aEndTime,$i);
			$n = floor(($adjend-$adjstart)/$maj);
			if( $n * 1.7 > $aNumSteps ) {
				$done=true;
			}
			$i++;
		}

		/*
		 if( 0 ) { // DEBUG
		 echo "    Start =".date("Y-m-d H:i:s",$aStartTime)."<br>";
		 echo "    End   =".date("Y-m-d H:i:s",$aEndTime)."<br>";
		 echo "Adj Start =".date("Y-m-d H:i:s",$adjstart)."<br>";
		 echo "Adj End   =".date("Y-m-d H:i:s",$adjend)."<p>";
		 echo "Major = $maj s, ".floor($maj/60)."min, ".floor($maj/3600)."h, ".floor($maj/86400)."day<br>";
		 echo "Min = $min s, ".floor($min/60)."min, ".floor($min/3600)."h, ".floor($min/86400)."day<br>";
		 echo "Format=$format<p>";
		 }
		 */

		if( $this->iStartTimeAlign !== false && $this->iStartAlign !== false ) {
			JpGraphError::RaiseL(3001);
			//('It is only possible to use either SetDateAlign() or SetTimeAlign() but not both');
		}

		if( $this->iStartTimeAlign !== false ) {
			if( $this->iStartTimeAlign >= 30 ) {
				$adjstart = $this->AdjStartTime($aStartTime,$this->iStartTimeAlign-30);
			}
			elseif(  $this->iStartTimeAlign >= 20 ) {
				$adjstart = $this->AdjStartTime($aStartTime,false,$this->iStartTimeAlign-20);
			}
			else {
				$adjstart = $this->AdjStartTime($aStartTime,false,false,$this->iStartTimeAlign);
			}
		}
		if( $this->iEndTimeAlign !== false ) {
			if( $this->iEndTimeAlign >= 30 ) {
				$adjend = $this->AdjEndTime($aEndTime,$this->iEndTimeAlign-30);
			}
			elseif(  $this->iEndTimeAlign >= 20 ) {
				$adjend = $this->AdjEndTime($aEndTime,false,$this->iEndTimeAlign-20);
			}
			else {
				$adjend = $this->AdjEndTime($aEndTime,false,false,$this->iEndTimeAlign);
			}
		}



		if( $this->iStartAlign !== false ) {
			if( $this->iStartAlign >= 30 ) {
				$adjstart = $this->AdjStartDate($aStartTime,$this->iStartAlign-30);
			}
			elseif(  $this->iStartAlign >= 20 ) {
				$adjstart = $this->AdjStartDate($aStartTime,false,$this->iStartAlign-20);
			}
			else {
				$adjstart = $this->AdjStartDate($aStartTime,false,false,$this->iStartAlign);
			}
		}
		if( $this->iEndAlign !== false ) {
			if( $this->iEndAlign >= 30 ) {
				$adjend = $this->AdjEndDate($aEndTime,$this->iEndAlign-30);
			}
			elseif(  $this->iEndAlign >= 20 ) {
				$adjend = $this->AdjEndDate($aEndTime,false,$this->iEndAlign-20);
			}
			else {
				$adjend = $this->AdjEndDate($aEndTime,false,false,$this->iEndAlign);
			}
		}
		$this->Update($img,$adjstart,$adjend);
		if( ! $this->ticks->IsSpecified() )
		$this->ticks->Set($maj,$min);
		if( $this->date_format == '' )
		$this->ticks->SetLabelDateFormat($format);
		else
		$this->ticks->SetLabelDateFormat($this->date_format);
	}
}


?>
